On 9/18/2020 10:18 AM, Ken O'Driscoll via mailop wrote: > You need to set up mail flow connectors in Exchange Online. > Authentication is certificate and/or IP based. > > I think this explains it fairly well: > https://docs.microsoft.com/en-us/exchange/mail-flow-best-practices/use-connectors-to-configure-mail-flow/set-up-connectors-to-route-mail > Thanks, but for outbound FROM m365 to the internet through a smarthost, this wouldn't suffice. We couldn't accept Microsoft's Cert or all of Microsoft's IPs for relay without significant risk of inevitable abuse.
I don't think I'm missing something on this but completely open to the fact that I might be. Regards, KAM
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